Long-Term Aging of NPP Ferritic Steels and Components

Paul Styman; Susan Ortner; Katharine Chivers; Elliot Long

doi:10.1520/STP164720220040

SYMPOSIA PAPER Published: 01 June 2023

STP164720220040

Long-Term Aging of NPP Ferritic Steels and Components

Source

A review of long-term thermal aging data from reactor pressure vessel steels shows that the main aging mechanism is embrittlement from phosphorus segregation to grain boundaries. Some softening can be seen in lightly tempered steels or hardening in high-copper steels. An investigation of data from the UK's Sizewell B reactor indicates that hardening may also be distinguishable around flaws if plastic zones are introduced just prior to service in a stress test.

Author Information

Styman, Paul

National Nuclear Laboratory, GB

Chivers, Katharine

EDF Energy, Gloucester, GB

Long, Elliot

Electric Power Research Institute, Palo Alto, CA, US

Ortner, Susan

National Nuclear Laboratory, GB

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Details

Pages: 105–120

DOI: 10.1520/STP164720220040

ISBN-EB: 978-0-8031-7742-0

ISBN-13: 978-0-8031-7741-3

Long-Term Aging of NPP Ferritic Steels and Components

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